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Age in Tayassu pecari according to dental eruption

100%

Margarido T. C. C. , Abilhoa V. , Monteiro-Filho E. L. A.

nr 2

The determination of the age composition of a population is considered to be a fundamental parameter for the analysis of life-history strategy of the species. In the Tayassuidae, the determination of relative age has been primarily based on molar tooth wear, sometimes combined with other external characteristics, such as hair color or body size. The present study examined the dental composition of white-lipped peccariesTayassu pecari (Link, 1795) . Through the determination of the erupted dental pattern and its relation to the body weight of the animal, six age classes were established. The presence of molar teeth was considered the most accurate parameter for establishing age classes for white-lipped peccaries.

Selected biological parameters and the abundance of the spawning population of roach Rutilus rutilus [L.] from Lakes Gardno and Łebsko

84%

Hornatkiewicz-Zbik A. , Ciepielewski W.

nr 2

The abundance of the spawning population of roach females from the coastal lakes Gardno (2 468 ha) and Łebsko (7 140 ha) located in the Słowiński National Park was estimated for the 1987-1992 period. Following bream, roach is the second most common cyprinid species in regulated fisheries catches. The size of the spawning population was estimated using Virtual Population Analysis and long-term fisheries statistics. Female roach dominated the exploited population at 62.4% in Lake Gardno and 64.3% in Lake Łebsko. During the analyzed period, more roach females were caught in Lake Gardno, which is more than twice as small as Lake Łebsko. Of the generations analyzed (1985, 1986, 1987, 1988, 1989 and 1990), more abundant years occurred in Lake Gardno. The most abundant generation in the two lakes was that of 1985, and following it, each subsequent generation was weaker than the preceding had been.

On the distribution and biology of roughscale sole Clidoderma asperrimum [Temminck et Schlegel, 1846] in the Pacific waters off the Northern Kuril Islands and Southeastern Kamchatka

67%

Tokranov A. M. , Orlov A. M.

2003

nr 2